generate-image

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Generate or edit images using AI models (FLUX, Gemini). Use for general-purpose image generation including photos, illustrations, artwork, visual assets, concept art, and any image that isn't a technical diagram or schematic. For flowcharts, circuits, pathways, and technical diagrams, use the scientific-schematics skill instead.

2installs

Sourcedavila7/claude-code-templates

Added on2026-02-04

NPX Install

npx skill4agent add davila7/claude-code-templates generate-image

SKILL.md Content

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Generate Image

Generate and edit high-quality images using OpenRouter's image generation models including FLUX.2 Pro and Gemini 3 Pro.

When to Use This Skill

Use generate-image for:

Photos and photorealistic images
Artistic illustrations and artwork
Concept art and visual concepts
Visual assets for presentations or documents
Image editing and modifications
Any general-purpose image generation needs

Use scientific-schematics instead for:

Flowcharts and process diagrams
Circuit diagrams and electrical schematics
Biological pathways and signaling cascades
System architecture diagrams
CONSORT diagrams and methodology flowcharts
Any technical/schematic diagrams

Quick Start

Use the

scripts/generate_image.py

script to generate or edit images:

bash

# Generate a new image
python scripts/generate_image.py "A beautiful sunset over mountains"

# Edit an existing image
python scripts/generate_image.py "Make the sky purple" --input photo.jpg

This generates/edits an image and saves it as

generated_image.png

in the current directory.

API Key Setup

CRITICAL: The script requires an OpenRouter API key. Before running, check if the user has configured their API key:

Look for a
```
.env
```
file in the project directory or parent directories
Check for
```
OPENROUTER_API_KEY=<key>
```
in the
```
.env
```
file
If not found, inform the user they need to:
- Create a
```
.env
```
  file with
```
OPENROUTER_API_KEY=your-api-key-here
```
- Or set the environment variable:
```
export OPENROUTER_API_KEY=your-api-key-here
```
- Get an API key from: https://openrouter.ai/keys

The script will automatically detect the

.env

file and provide clear error messages if the API key is missing.

Model Selection

Default model:

google/gemini-3-pro-image-preview

(high quality, recommended)

Available models for generation and editing:

```
google/gemini-3-pro-image-preview
```
- High quality, supports generation + editing
```
black-forest-labs/flux.2-pro
```
- Fast, high quality, supports generation + editing

Generation only:

```
black-forest-labs/flux.2-flex
```
- Fast and cheap, but not as high quality as pro

Select based on:

Quality: Use gemini-3-pro or flux.2-pro
Editing: Use gemini-3-pro or flux.2-pro (both support image editing)
Cost: Use flux.2-flex for generation only

Common Usage Patterns

Basic generation

bash

python scripts/generate_image.py "Your prompt here"

Specify model

bash

python scripts/generate_image.py "A cat in space" --model "black-forest-labs/flux.2-pro"

Custom output path

bash

python scripts/generate_image.py "Abstract art" --output artwork.png

Edit an existing image

bash

python scripts/generate_image.py "Make the background blue" --input photo.jpg

Edit with a specific model

bash

python scripts/generate_image.py "Add sunglasses to the person" --input portrait.png --model "black-forest-labs/flux.2-pro"

Edit with custom output

bash

python scripts/generate_image.py "Remove the text from the image" --input screenshot.png --output cleaned.png

Multiple images

Run the script multiple times with different prompts or output paths:

bash

python scripts/generate_image.py "Image 1 description" --output image1.png
python scripts/generate_image.py "Image 2 description" --output image2.png

Script Parameters

```
prompt
```
(required): Text description of the image to generate, or editing instructions
```
--input
```
or
```
-i
```
: Input image path for editing (enables edit mode)
```
--model
```
or
```
-m
```
: OpenRouter model ID (default: google/gemini-3-pro-image-preview)
```
--output
```
or
```
-o
```
: Output file path (default: generated_image.png)
```
--api-key
```
: OpenRouter API key (overrides .env file)

Example Use Cases

For Scientific Documents

bash

# Generate a conceptual illustration for a paper
python scripts/generate_image.py "Microscopic view of cancer cells being attacked by immunotherapy agents, scientific illustration style" --output figures/immunotherapy_concept.png

# Create a visual for a presentation
python scripts/generate_image.py "DNA double helix structure with highlighted mutation site, modern scientific visualization" --output slides/dna_mutation.png

For Presentations and Posters

bash

# Title slide background
python scripts/generate_image.py "Abstract blue and white background with subtle molecular patterns, professional presentation style" --output slides/background.png

# Poster hero image
python scripts/generate_image.py "Laboratory setting with modern equipment, photorealistic, well-lit" --output poster/hero.png

For General Visual Content

bash

# Website or documentation images
python scripts/generate_image.py "Professional team collaboration around a digital whiteboard, modern office" --output docs/team_collaboration.png

# Marketing materials
python scripts/generate_image.py "Futuristic AI brain concept with glowing neural networks" --output marketing/ai_concept.png

Error Handling

The script provides clear error messages for:

Missing API key (with setup instructions)
API errors (with status codes)
Unexpected response formats
Missing dependencies (requests library)

If the script fails, read the error message and address the issue before retrying.

Notes

Images are returned as base64-encoded data URLs and automatically saved as PNG files
The script supports both
```
images
```
and
```
content
```
response formats from different OpenRouter models
Generation time varies by model (typically 5-30 seconds)
For image editing, the input image is encoded as base64 and sent to the model
Supported input image formats: PNG, JPEG, GIF, WebP
Check OpenRouter pricing for cost information: https://openrouter.ai/models

Image Editing Tips

Be specific about what changes you want (e.g., "change the sky to sunset colors" vs "edit the sky")
Reference specific elements in the image when possible
For best results, use clear and detailed editing instructions
Both Gemini 3 Pro and FLUX.2 Pro support image editing through OpenRouter

Integration with Other Skills

scientific-schematics: Use for technical diagrams, flowcharts, circuits, pathways
generate-image: Use for photos, illustrations, artwork, visual concepts
scientific-slides: Combine with generate-image for visually rich presentations
latex-posters: Use generate-image for poster visuals and hero images

generate-image

NPX Install

Tags

SKILL.md Content

Generate Image

When to Use This Skill

Quick Start

API Key Setup

Model Selection

Common Usage Patterns

Basic generation

Specify model

Custom output path

Edit an existing image

Edit with a specific model

Edit with custom output

Multiple images

Script Parameters

Example Use Cases

For Scientific Documents

For Presentations and Posters

For General Visual Content

Error Handling

Notes

Image Editing Tips

Integration with Other Skills